Caladenia campbellii (Thick-stem Caladenia)

Advice to the Minister for the Environment and Heritage from the Threatened Species Scientific Committee (TSSC) on Amendments to the list of Threatened Species under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act)

1. Scientific name, common name (where appropriate), major taxon group

Caladenia campbellii (Thick-stem Caladenia)

2. National Context

The species is endemic to Tasmania. The species is currently listed as endangered under the EPBC Act. It is proposed for listing as endangered under the Tasmanian Threatened Species Protection Act 1995.

3. How judged by TSSC in relation to the EPBC Act criteria.

TSSC judges the species to be eligible for listing as critically endangered under the EPBC Act. The justification against the criteria is as follows:

Criterion 1 - Decline in numbers

There is no quantitative data available against this criterion.

Criterion 2 - Geographic distribution

The geographic distribution of the species is precarious for the survival of the species and is restricted. The area of occupancy is 1.2 - 2ha and extent of occurrence is 0.7km2. The species is known from two populations. Continuing decline in the area, extent and quality of habitat, the number of populations and number of mature individuals is projected due to agricultural development and vehicle disturbance.

Therefore, the species is eligible for listing as endangered under this criterion.

Criterion 3 - Population size and decline in numbers or distribution

The total number of mature individuals is very low, there being a total of 60-100 mature individuals in two populations, neither population containing more than 50 plants. As continuing decline in the area, extent and quality of habitat, the number of populations and number of mature individuals is projected due to agricultural development and vehicle disturbance, the population size and geographic distribution is precarious for the survival of the species.

Therefore, the species is eligible for listing as critically endangered under this criterion.

Criterion 4 - Population size

The number of mature individuals is very low with the total population recorded to number between 60 and 100 mature individuals.

Therefore, the species is eligible for listing as endangered under this criterion.

Criterion 5 - Probability of extinction in the wild

There is no quantitative data available against this criterion.

4. Conclusion

The species exists in very low numbers (60-100) in two populations neither containing more than 50 individuals. The geographic distribution, area of occupancy being 1.2 - 2ha and extent of occurrence, 0.7km2, is precarious for the survival of the species in the face of projected declines in the area, extent and quality of habitat, the number of populations and number of mature individuals due to agricultural development and vehicle disturbance. The species is eligible for listing as critically endangered under criterion 3.

5. Recommendation

TSSC recommends that the list referred to in section 178 of the EPBC Act be amended by
transferring from the endangered category to the critically endangered category:

Caladenia campbellii (Thick-stem Caladenia)